Book/Report

FZJ-2019-03638

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Populationsdynamik des Phytoplanktons: Datenanalyse und Modellierung der Dynamik der Primärproduktion in der Haltener Talsperre

Siegel, H. (Corresponding author)FZJ*

1998
Forschungszentrum Jülich, Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/22432

Report No.: Juel-3509

Abstract: The present study is concerned with the comprehensive and detailed analysis of processes involved in the dynamics of primary production. This work is facilitated by exceptional database on extraordinarily long-term sampled limnological records from the eutrophic Haltern lowland dam reservor /Germany (Westphal 1988 [Wes88]). Several distinct conclusions can be drawn on the interactions between inorganic nutrients and primary production: • As well chlorophyll fluorescence as the pH-value and concentrations of the inorganic nutritients $\textbf{P, Fe, N, Si}$ reveal distinct annual cycles (coefficient of determination r$^{2}$ ≈ 0.4) with a (statistically) proof calendrical sequence in time.• The abundance of – H$^{+}$, – total phosphorus (T$_{P}$), – soluble reactive phosphorus (SRP), – soluble iron ($\textbf{Fe}$) and – silicea (Si) are immediately coupled to the rise and fall of primary production. These data are lognormally distributed. In contrast, the more persistent autocorrelation, more deviant dispersion and delayed calendrical minimum of nitrate data account for a less stringent coupling of nitrate breakdown processes to primary production. • Whereas the annual cycle of primary production is predominantly enforced by meteorological factors, short-term fluctuations of global irradiance and water temperature exert only weak control in the immediate rise and fall of primary production. For intermediate time scales (≈ 27-35 days), phytoplankton dynamics mainly associates with grazing. In particular, cladocerans, rotifers, and copepods exhibit seasonally differentiated predation effects, that can approximately be quantified. • The recurrent appearance of these grazers at fixed calendrical dates impinges a seasonal pattern of variations in primary production. The latter can be discerned from annual cycling. Its calendrical persistence is statistically proof. The seasonal recurrence of predator-prey oscillations is caused by the pacemaker activity, exerted by autogenic developmental cycles of individual herbivore grazers. [...]

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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